问题补充:
Mum,you really need to have a rest!You in the kitchen ever since you came back home three hours ago.
A. had worked
B. were working
C. have been working
D. worked
答案:
A. had worked
B. were working
(答案→)C. have been working
D. worked
解析:
句意为:妈妈你真的需要休息了!从你三小时前回到家里,你就一直在厨房干活。强调从过去开始的某一动作一直延续至今并仍在进行时,用现在完成进行时。